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Yes but take my RGY for example, its only got 100mw of red and 50mw of green, if I stuck a 105mw blue ray in there with them and combined them, what colours would I get? Obviously you wont see much anyway, add a little smoke before hand.

Second point to this is a 473nm at 50mw is £250 as you say but you could make a 405nm with double the power for £20.

Im tempted to get a blue ray and combine it with my green pointer to see what happens.

Yes but take my RGY for example, its only got 100mw of red and 50mw of green, if I stuck a 105mw blue ray in there with them and combined them, what colours would I get? Obviously you wont see much anyway, add a little smoke before hand.

Second point to this is a 473nm at 50mw is £250 as you say but you could make a 405nm with double the power for £20.

Im tempted to get a blue ray and combine it with my green pointer to see what happens.[/quote]

I've combined the correct amounts of 405, 532, and 650 and have come up with 'white' in a Styrofoam cup. The reason I used the cup is because it's reflective and I didn't need to worry about where I shined the beams, as long as they were in the cup. So in theory, you could make a poor mans RGB with this. But, like andy said, I wouldn't pour money into making a full blown scanner with the 405nm diodes. If you already have parts laying around, go for it. But if you're buying expencive parts to build a quality scanner, you're better off just buying a decent 473.

But, what I WOULD like to see, is someone using the correct glass etc. to make a white beam with the blu-ray. THAT would be cool.